improve the navbar top display in example--fixes #9635
improve the navbar top display in example--fixes #9635

BS3 commit 61a395338d34270152ee8d6c46aff420aa73c431

up2vs/todc-bootstrap,2947721120/todc-bootstrap,ztx1491/todc-bootstrap,todc/todc-bootstrap,2947721120/googlebt4,aaroncnhk/todc-bootstrap,mozillo/todc-bootstrap,todc/todc-bootstrap,todc/todc-bootstrap